EP3253133A1 - Verhalten für drahtlose sende-/empfangseinheit und mac-steuerelemente für lte-drx-vorgänge - Google Patents

Verhalten für drahtlose sende-/empfangseinheit und mac-steuerelemente für lte-drx-vorgänge Download PDF

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Publication number
EP3253133A1
EP3253133A1 EP17182889.0A EP17182889A EP3253133A1 EP 3253133 A1 EP3253133 A1 EP 3253133A1 EP 17182889 A EP17182889 A EP 17182889A EP 3253133 A1 EP3253133 A1 EP 3253133A1
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EP
European Patent Office
Prior art keywords
drx
wtru
timer
cycle
mac
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP17182889.0A
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English (en)
French (fr)
Inventor
Jin Wang
Guodong Zhang
Stephen E. Terry
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InterDigital Patent Holdings Inc
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InterDigital Patent Holdings Inc
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Filing date
Publication date
Application filed by InterDigital Patent Holdings Inc filed Critical InterDigital Patent Holdings Inc
Publication of EP3253133A1 publication Critical patent/EP3253133A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2612—Arrangements for wireless medium access control, e.g. by allocating physical layer transmission capacity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1848—Time-out mechanisms
    • H04L1/1851—Time-out mechanisms using multiple timers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
    • H04W52/0216—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave using a pre-established activity schedule, e.g. traffic indication frame
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/28—Discontinuous transmission [DTX]; Discontinuous reception [DRX]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • This application is related to wireless communications.
  • discontinuous reception is used between the network and a User Equipment (UE) to save the power of the UE.
  • the UE may be configured by a radio resource control/media access control (RRC/MAC) with a DRX functionality that allows it to stop monitoring the packet data control channel (PDCCH) for a period of time (i.e., a sleep period).
  • RRC/MAC radio resource control/media access control
  • the DRX functionality consists of a long DRX cycle, a DRX inactivity timer, and a DRX retransmission timer.
  • the DRX functionality optionally includes a short DRX cycle and a DRX short cycle timer, which are all defined in the 3GPP specification.
  • the long DRX cycle provides a longer sleep period for the UE than does the short DRX cycle.
  • the active time is defined as the time that the UE is awake.
  • this includes the on duration which is the time that the UE is continuously monitoring the PDCCH while the DRX inactivity timer has not expired, and the time that the UE is continuously monitoring the PDCCH while any DRX retransmission timer is running.
  • the DRX cycle specifies the periodic repetition of the on duration followed by a possible period of inactivity.
  • the DRX inactivity timer specifies the number of consecutive transmission time intervals (TTIs) during which the UE monitors the PDCCH after successfully decoding a PDCCH transmission which indicates an initial uplink or downlink user data transmission for the UE.
  • TTIs transmission time intervals
  • This DRX inactivity timer is restarted if a new PDCCH transmission is detected while the timer is still running. Expiration of the DRX inactivity timer indicates that a particular duration of inactivity has elapsed for receiving any PDCCH transmission.
  • the DRX retransmission timer specifies the maximum number of consecutive TTIs the UE monitors the PDCCH when a downlink retransmission is expected by the UE.
  • the DRX short cycle timer specifies a number of consecutive TTIs that the UE shall follow the short DRX cycle after the DRX inactivity timer has expired.
  • the hybrid automatic repeat-request (HARQ) round-trip time (RTT) timer specifies the minimum amount of TTIs before a downlink HARQ retransmission is expected by the UE.
  • HARQ hybrid automatic repeat-request
  • RTT round-trip time
  • the DRX on duration timer specifies a number of consecutive PDCCH subframes at the beginning of a DRX cycle and specifies the number of consecutive TTIs during which the UE monitors the PDCCH for possible allocations.
  • the DRX on duration is a part of a DRX cycle.
  • the UE may be configured by the RRC/MAC with a DRX functionality that allows it to stop monitoring PDCCH during some period of time. Regardless of whether the UE is monitoring PDCCH, the UE receives and transmits HARQ feedback when such is expected.
  • Figure 2 illustrates an example DRX cycle timing diagram 200, as a demonstration of problems that may arise with interworking of the various DRX timers during the selection of a short DRX cycle or a long DRX cycle.
  • an initial DRX inactivity timer start 201 can occur during any subframe or TTI within the DRX on duration.
  • the DRX inactivity timer duration 202 is fixed.
  • the DRX inactivity timer expiration is uncertain to both the eNode-B and the UE.
  • the DRX short cycle timer is configured to start when the DRX inactivity timer expires, then the new DRX short cycle timer will start at an uncertain subframe or TTI. As a result, the eNode-B does not know with certainty when the short DRX cycle timer starts and the short DRX cycle may no longer be aligned with the long DRX cycle.
  • a method and apparatus for selection of DRX short cycle or DRX long cycle, starting a short DRX cycle timer, controlling termination and expiration of DRX timers, and handling MAC control elements defined to control these DRX parameters.
  • the method and apparatus are applicable to RRC_Connected mode for both downlink and uplink transmissions.
  • wireless transmit/receive unit includes but is not limited to a user equipment (UE), a mobile station, a fixed or mobile subscriber unit, a pager, a cellular telephone, a personal digital assistant (PDA), a computer, or any other type of user device capable of operating in a wireless environment.
  • base station includes but is not limited to a Node-B, a site controller, an access point (AP), or any other type of interfacing device capable of operating in a wireless environment.
  • Figure 3 shows a wireless communication system 300 including a plurality of WTRUs 310, and a base station 320. As shown in Figure 3 , the WTRUs 310 are in communication with the base station 320, and the base station 320 is in communication with a network 330. Although three WTRUs 310 and base station 320 are shown in Figure 3 , it should be noted that any combination of these wireless devices may be included in the wireless communication system 300.
  • FIG 4 is a functional block diagram 400 of the WTRU 310 and the base station 320 of the wireless communication system 300 shown in Figure 3 .
  • the WTRU 310 is in communication with the base station 320.
  • the WTRU 310 includes a processor 415, a receiver 416, a transmitter 417, and an antenna 418.
  • the processor 415 is configured to perform the methods disclosed herein for setting DRX timers and selecting DRX cycle lengths during RRC_Connected mode, in conjunction with the DRX timers: a DRX inactivity timer 410, a DRX retransmission timer 411, a DRX short cycle timer 412, a DRX long cycle timer 413, a DRX on duration timer 414, and a HARQ RTT timer 419.
  • the receiver 416 and the transmitter 417 are in communication with the processor 415.
  • the antenna 418 is in communication with both the receiver 416 and the transmitter 417 to facilitate the transmission and reception of wireless data.
  • the base station 320 includes a processor 425, a receiver 426, a transmitter 427, and an antenna 428.
  • the processor 425 is configured to define and send MAC control elements for controlling the WTRU DRX cycles during RRC_Connected mode.
  • the receiver 426 and the transmitter 427 are in communication with the processor 425.
  • the antenna 428 is in communication with both the receiver 426 and the transmitter 427 to facilitate the transmission and reception of wireless data.
  • the WTRU 310 behavior is defined for operation of the DRX short cycle timer 412, the DRX long cycle timer 413, the short DRX cycle, and the long DRX cycle with respect to expiration of DRX inactivity timer 410.
  • the DRX short cycle timer 412 starts from a known time boundary, such as a predefined time when the short DRX cycle should start. The DRX short cycle timer 412 does not start immediately when the DRX inactivity timer expires 410.
  • the DRX short cycle timer 412 is triggered following expiration of the DRX inactivity timer 410, at a subframe or TTI that is a known time boundary for the DRX short cycle timer 412 to be triggered. In this way, the short DRX cycle can be easier synchronized with the long DRX cycle.
  • the following presents several options for the WTRU 310 to deal with different scenarios for the DRX cycle timers.
  • a DRX long cycle timer is utilized in addition to the DRX short cycle timer.
  • the DRX long cycle timer is a parameter that specifies the number of consecutive subframe(s) the WTRU 310 shall follow the long DRX cycle after the DRX Inactivity Timer has expired.
  • both the DRX long cycle timer 413 and the DRX short cycle timer 412 are both running simultaneously, each timer having started at the beginning of the configured DRX cycle.
  • the DRX short cycle timer 412 is not triggered by other factors, and starts and expires autonomously (e.g., irrespective of whether the DRX inactivity timer 410 expires).
  • the DRX short cycle timer 412 is aligned with the start of the long DRX cycle (and is a fraction of long DRX cycle) until the end of the configured DRX cycle.
  • Figure 5 shows a method flowchart 500 for operation of the DRX cycle timers under the first scenario, when the DRX inactivity timer 410 expires.
  • the DRX inactivity timer 410 expires in the downlink subframe.
  • the processor 415 enters the long DRX cycle at 505 if the short DRX cycle is not configured. If the short DRX cycle is configured, the WTRU processor 415 determines if the DRX short cycle timer 412 has expired at 503. If the DRX short cycle timer 412 has not expired, then the processor 415 enters the short DRX cycle at 504.
  • the processor 415 enters the long DRX cycle or starts the DRX short cycle timer 412 at 506 if the DRX short cycle timer 412 has expired at 503. Whether to use the long DRX cycle or to start the DRX short cycle timer 412 at 506 may be pre-programmed or configured by the eNode-B 320 for either option during the RRC setup process. If the DRX short cycle timer option is implemented and it expires in the downlink subframe, then the processor 415 uses the long DRX cycle.
  • both the DRX long cycle timer 413 and the DRX short cycle timer 412 are started at the beginning of the configured DRX cycle, and the DRX short cycle timer 412 may be terminated by the eNode-B 320.
  • the eNode-B 320 may send a MAC control element (CE) with an instruction for the WTRU 310 to terminate the DRX short cycle timer.
  • CE MAC control element
  • the long DRX cycle is used before triggering any short DRX cycle.
  • the long DRX cycle is the default DRX cycle.
  • Figure 6 shows a method flow chart for the WTRU 310 entering the long DRX cycle or the short DRX cycle in the case of the second or the third scenarios.
  • a determination is made at 602 as to whether the short DRX cycle is configured. If the short DRX cycle is configured, the processor 415 compares the elapsed time from the start of the DRX long cycle timer 413 at 603 against the short DRX cycle length. If the DRX long cycle timer 413 elapsed time is equal to M (short DRX cycle length), where M is an integer and M ⁇ N, then the processor 415 starts the DRX short cycle timer 412 at 606.
  • the processor 415 may enter the long DRX cycle. Whether to use the long DRX cycle or to start the DRX short cycle timer may be pre-programmed or may be configured by the eNode-B 320 for either option during the RRC setup process. If at 603, the processor 415 determines the DRX long cycle timer 413 elapsed time is less than M (short DRX cycle length), then the processor 415 waits until the elapsed time is equal to M (short DRX cycle length) at 604, before starting the DRX short cycle timer 412 or entering the long DRX cycle at 606.
  • the processor 415 waits until the subframe or TTI where the DRX long cycle timer 413 elapsed time equals ( M + 1)(short DRX cycle length), then starts the DRX short cycle timer 412 or enters the long DRX cycle at 606.
  • the processor 415 may enter the long DRX cycle at 606 without starting DRX short cycle timer 412.
  • the WTRU enters the long DRX cycle at 607 if the short DRX cycle is not configured.
  • the WTRU behavior is defined for operation of the DRX short cycle timer 412, the DRX long cycle timer 413, the short DRX cycle, and the long DRX cycle with respect to expiration of the DRX on duration timer 414.
  • Figure 7 shows a method flow chart 700 for the WTRU processor 415 to select the short DRX cycle or the long DRX cycle when the DRX on duration timer 414 expires. After the DRX on duration timer 414 expires in the downlink subframe at 701, the processor 415 determines whether the short DRX cycle is configured at 702.
  • the processor 415 starts the DRX short cycle timer 412 at 703 and the WTRU processor 415 enters the short DRX cycle at 704. If the short DRX cycle is not configured at 702, the WTRU processor 415 enters the long DRX cycle at 706.
  • the processor 415 may start the DRX short cycle timer 412 (at 703) at the subframe when elapsed time from the start of current long DRX cycle is equal to an integer N times the short DRX cycle length (i.e., N(short DRX cycle length)).
  • the WTRU processor 415 may directly enter the long DRX cycle upon expiration of the DRX on duration timer 414 in the downlink subframe, irrespective of whether the short DRX cycle is configured in 702.
  • a DRX MAC CE is defined to signal the WTRU 310 to terminate any running DRX timers and WTRU behavior is defined for responding to receiving a DRX MAC CE.
  • a DRX command is defined as a MAC CE to signal the WTRU 310 to stop the DRX on duration timer 414 and the DRX inactivity timer 410. This is an indication to the WTRU processor 415 that it can stop monitoring and decoding the PDCCH for initial transmissions for the remainder of the current DRX cycle.
  • the WTRU 310 behaviour is defined as follows.
  • the WTRU 310 When a DRX cycle has been configured and the WTRU 310 receives a MAC PDU on a downlink-shared channel (DL-SCH) that contains a DRX CE, the DRX on duration timer 414 and the DRX inactivity timer 410 are stopped during the subframe or TTI. If there are no other timers (e.g., a DRX retransmission timer) running when the DRX on duration timer 414 and the DRX inactivity timer 410 are stopped in this subframe or TTI, and if the short DRX cycle is configured, the processor 415 starts the DRX short cycle timer 412 and uses the short DRX cycle. If the short DRX cycle is not configured, the processor 415 enters the long DRX cycle.
  • DL-SCH downlink-shared channel
  • the WTRU starts the DRX long cycle timer 413.
  • a MAC control element may be defined to stop any or all running timers related to downlink and uplink transmissions during a DRX cycle. There may be different types of MAC CEs defined to distinguish the stop of any or all running timers related to uplink transmissions and downlink transmissions during DRX operations.
  • the WTRU 310 receives a downlink related DRX MAC CE, then the WTRU processor 415 stops all related timers (e.g., the DRX on duration timer 414, the DRX inactivity timer 410, the DRX retransmission timer 411 and HARQ RTT timer 419.) The WTRU 310 also suspends all downlink related reception and flushes the data saved in the HARQ buffer. Conversely, if the WTRU 310 receives an uplink related DRX MAC CE, then WTRU processor 415 stops all timers related to the uplink transmission during the DRX period. The WTRU 310 also suspends all uplink related reception and flushes the data saved in the buffer.
  • the WTRU processor 415 stops all related timers related to the uplink transmission during the DRX period. The WTRU 310 also suspends all uplink related reception and flushes the data saved in the buffer.
  • the DRX MAC CE may only force downlink related DRX timers to stop; only force uplink related DRX timers to stop, or force all DRX related timers (downlink/uplink) to stop.
  • the eNode-B 320 transmits a DRX MAC CE signal to the WTRU 310.
  • the signal explicitly notifies the WTRU 310 as to whether it should enter a short DRX cycle or a long DRX cycle.
  • a one-bit indication in the DRX MAC CE can be used for this explicit signaling.
  • the DRX MAC CE only stops the DRX related timers, and then the WTRU 310 enters a short DRX cycle.
  • the DRX MAC CE only stops the DRX related timers, and then the WTRU processor 415 enters a long DRX cycle.
  • the WTRU processor 415 starts the DRX short cycle timer and uses the short DRX cycle. If the short DRX cycle is not configured, then the WTRU processor 415 uses the long DRX cycle.
  • ROM read only memory
  • RAM random access memory
  • register cache memory
  • semiconductor memory devices magnetic media such as internal hard disks and removable disks, magneto-optical media, and optical media such as CD-ROM disks, and digital versatile disks (DVDs).
  • Suitable processors include, by way of example, a general purpose processor, a special purpose processor, a conventional processor, a digital signal processor (DSP), a plurality of microprocessors, one or more microprocessors in association with a DSP core, a controller, a microcontroller, Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) circuits, any other type of integrated circuit (IC), and/or a state machine.
  • DSP digital signal processor
  • ASICs Application Specific Integrated Circuits
  • FPGAs Field Programmable Gate Arrays
  • a processor in association with software may be used to implement a radio frequency transceiver for use in a wireless transmit receive unit (WTRU), user equipment (UE), terminal, base station, radio network controller (RNC), or any host computer.
  • the WTRU may be used in conjunction with modules, implemented in hardware and/or software, such as a camera, a video camera module, a videophone, a speakerphone, a vibration device, a speaker, a microphone, a television transceiver, a hands free headset, a keyboard, a Bluetooth® module, a frequency modulated (FM) radio unit, a liquid crystal display (LCD) display unit, an organic light-emitting diode (OLED) display unit, a digital music player, a media player, a video game player module, an Internet browser, and/or any wireless local area network (WLAN) or Ultra Wide Band (UWB) module.
  • WLAN wireless local area network
  • UWB Ultra Wide Band

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
EP17182889.0A 2008-03-14 2009-03-13 Verhalten für drahtlose sende-/empfangseinheit und mac-steuerelemente für lte-drx-vorgänge Withdrawn EP3253133A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US3683308P 2008-03-14 2008-03-14
EP09720843.3A EP2263406B1 (de) 2008-03-14 2009-03-13 Verhalten für drahtlose sende-/empfangseinheit und mac-steuerelemente für lte-drx-vorgänge

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EP09720843.3A Active EP2263406B1 (de) 2008-03-14 2009-03-13 Verhalten für drahtlose sende-/empfangseinheit und mac-steuerelemente für lte-drx-vorgänge

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US (4) US8488521B2 (de)
EP (2) EP3253133A1 (de)
JP (5) JP5291127B2 (de)
KR (4) KR101609498B1 (de)
CN (2) CN102017726B (de)
AU (1) AU2009223261B2 (de)
DK (1) DK2263406T3 (de)
ES (1) ES2644977T3 (de)
MX (1) MX2010010030A (de)
PL (1) PL2263406T3 (de)
TW (2) TWI496431B (de)
WO (1) WO2009114802A1 (de)

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